Correlator bank-systems VS Matched Filter Systems
2-Stage Matched Filter (2-PMF) Technology
Matched filter has been known to offer shorter
acquisition time, but was criticized for its size,
which limits its applicability in consumer
products. GBT's invention of the 2-Stage Matched
Filter (2-PMF) architecture is the first receiver
structure that makes efficient handling of
packet-switch wireless data communication
commercially feasible.
Wide-band packet-based systems of any standard pose
major challenges in signal acquisition multipath processing, inter-frequency handover implementation,
and power consumption. GBT?s 2-PMF architecture
answers all these challenges and is essential to all developers of WP-CDMA products.
GBT?s 2-PMF is applicable for consumer devices
because it does not impose impractical requirements
with respect to size, power consumption and costs.
Its short acquisition time makes efficient handling
of packet switched communication feasible. It can
also monitor the received signal and rapidly adapt
to the changing channel characteristics in a mobile environment. It enables implementation of the
smallest, least power consumptive and least expensive consumer products.
Signal Acquisition
Wide-band system's incoming signal has a higher
data rate and is embedded in a much wider bandwidth.
Acquisition processes are used for:
? Cell identification (cold start)
? Cell list update (continual)
? Multipath identification
Good quality of acquisition generates:
? Quick ?dial-up tone? or network access
? Best communication performance (RAKE)
? Long standby time
Standby time affected by:
? RF System (transmitter and receiver sections)
? IMT2000 Baseband System
IMT2000 Acquisition System
Acquisition System Performance
Can Correlator Bank based systems equal the acquisition performance of Matched Filter based systems?
1) Acquistion Time
2) Device Power Consumption
3) Handset Standby Power Cons
Matched Filter
1) Reference
2) Reference
3) Reference
Full Correlator Bank
1) Same
2) 2.7x Larger
3) 2.2x Larger
Partial Correlator Bank
1) 3x Longer
2) Same
3) 3x Larger
? One cell-search every wake-up period
? RF/ASIC power consumption 30% - 70% in receive mode
Total System Acquisition Performance (3GPP)
? Primary synchronization channel
? Verification interval is 10 ms
? ITU Outdoor Type A Channel at 40 mph
Multipath Identification and Processing Using Matched Filters
? Rapid and accurate identification of complex channel characteristics
? Ability to identify weak signal propagation paths and their characteristics
? Ability to implement RAKE combining and maintain high link quality even in rapidly changing channels
? Ability to maintain high quality links in vehicular applications
Signal and Multipath
Signal and Multipath (detail)
GBT Integrated Matched Filter Receiver Features
The Matched Filter greatly enhances the performance of the core W-CDMA receiver functions:
? RAKE
? Acquisition
? Channel / SNR estimator
? TCP
GBT W-CDMA Device Block Diagram
GBT MF-Specific Patents/ Patent Applications
? Programmable Two-Part Matched Filter for Spread Spectrum (USP No. 5,627,855)
? Apparatus and Method for Synchronization of Direct Sequence CDMA Signals (USP No. 5,872,808)
? Parallel Correlator Architecture for Synchronizing Direct Sequence Spread-Spectrum Signals (USP No. 5,894,494)
? Coherent Detection Using Matched Filter Enhanced Spread Spectrum Demodulation
? Spread Spectrum Multipath Combining Subsystem and Method (USP No. 5,956,369)
? Spread Spectrum Multipath Receiver Without a Tracking Loop (Allowed)
? Multi-clock Matched Filter for Receiving Signals with Multipath
? Parallel Code Matched Filter
? Matched Filter Based Handoff Method and Apparatus (USP 5,864,578)
? Intelligent Power Management for a Programmable Matched Filter (USP No. 5,764,691)
? Symbol-Matched Filter Having a Low Silicon and Power Requirement (USP No. 5,715,276)
From another page on the GBT site:
4G Basic Definition
? High Data Rates:
? Adjustable Asymmetric Traffic Operation
? (27Mbps Downlink, 768Kbps Uplink Typical)
? Up to 28Mbps, Comparable to the
New Digital Cable by AT&T
? Variable Packet Size Transmission
? IP Backbone
? Voice over IP
? Mobile Cellular Handoff
? U NII 450MHz Wideband Frequency
GBT envisions the 4G cellular network to be the
ultimate network of all networks. 4G gives a new
meaning to the cellular technology, which will revolutionize the WANs, LANs, Paging/ Cellular
Networks, television networks and radio networks.
The technical compatibility of all these networks
creates an open platform cellular system in which
users can use the same phones (or other terminals) throughout all these networks. The 4G ultimate
mobile phone will be the one device needed for
voice, data, internet, e-commerce, video or music
on demand and digital streaming whether you are
outdoor or at your home or office.
GBT's possesses the essential expertise for 4G.
GBT's Matched Filter technology is the most optimal receiving structure for wireless packet data
transmission and GBT has pioneered CPCH, the standard packet structure for IMT2000.
gbtwireless.com |
